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Unformatted text preview: considerably: General: 0 = Z CS ~ V ~ ndA (13) 1-D inlets &amp; outlets: X i ( A i V i ) out = X i ( A i V i ) in (14) X i Q i out = X i Q i in (15) Average velocity: V av = Q A (16) Warnings Equation 3.29 contains a term (crossed-out) with errors. It reads: d dt Z CV t dv (17) Should read: Z CV t d V (18) No real ow is truly incompressible. You must judge whether the variations in need to be considered. Sometimes ( e.g., liquids with narrow temperature range), it is obviously a good approximation. In other cases, must be compared to and considered more carefully. In-class examples: 3-14, 3-27...
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